TZA1000 Просмотр технического описания (PDF) - Philips Electronics

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TZA1000

QIC read-write amplifier

Philips Electronics 

Philips Semiconductors

QIC read-write amplifier

Preliminary specification

TZA1000

Table 14 Write mode select; note 1

WDM

0

1

EXPECTED INPUT SIGNAL

WDI

WD

Note

1. Control bits W0 to W6 make up a 7-bit number between 0 and 127. Write current is

1----2---5-----×---1---(2--W--8------+-----1---)- mA (Rref = 430 Ω).

FUNCTION

on

bypassed

Table 15 Sense current range select; note 1

SDB

0

1

CURRENT

0 to 15 mA

0 to 30 mA

Note

1. Control bits S0 to S6 make up a 7-bit number between 0 and 127. Sense current is 1----5-----×---1---(-2-S--8----+-----1---)- mA when SDB = 0

and 3----0-----×---1---(-2-S--8----+-----1---)- mA when SDB = 1 (Rref = 430 Ω).

Status

A status byte, located at address FF, contains the following status bits:

Table 16 Status byte settings

ADDRESS

FF

D7

AG3(1)

D6

AG2(1)

D5

AG1(1)

D4

AG0(1)

D3

DN(2)

D2

PF5(3)

Notes

1. Actual gain. Allows the gain to be determined while the AGC is on.

2. This bit can be used for microcontroller gain control, with the AGC off (see Table 17).

3. Power failure detected on the +5 V supply (VDD1).

4. Write unsafe detected: head open or short circuited.

5. Power failure detected on the +12 V supply (VDD3).

D1

WUS(4)

Table 17 Sense current range select.

DN

0

1

GAIN

can be increased

can be decreased

D0

PF12(5)

1998 Mar 17

12

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